Should I get high quality headphones when I only listen to Pandora/Spotify?

Hello. I listen to music a lot. It's only Pandora and my playlists on Spotify though. I figured that I'd get high quality headphones since I'm listening to music so much. I'm currently planning to get a pair of Sennheiser Momentum 2 headphones (I need bluetooth). I wanted these because of all the reviews online and on Amazon, raving about what good sound quality they have. I have been assuming that everyone listens to Pandora or Spotify, but then I read about FLAC files. So I'm thinking that people might be writing their reviews based on higher quality music that has been purchased. Would headphones like these Sennheisers in my cart be a waste of money since I'm only listening to Spotify/Pandora and not high quality music? I don't care about the noise cancellation too much.